Audio problem: In the opening scene the camera shows a close up of "Bumper singing please don't stop the" (repeatedly) then pans to the Bellas off stage. His singing doesn't match the audio. In fact several times during that performance there is audio of him singing but his mouth is not moving. (00:01:30)
Bumper: I sometimes have the feeling we should kiss.
Fat Amy: I sometimes have the feeling I should do crystal meth, but then I think, hmmm... Better not.